Recent Topics
Replcaing just one injector?
by Spetz
07/28/14 04:01 AM
Craftsman Programmable Digital Tire Gauge $9.99
by Warstud
07/28/14 03:43 AM
Cutting open oil filter...?
by Wordfreak
07/28/14 01:44 AM
The BITOG LOL smiley is AWAL
by Merkava_4
07/28/14 01:43 AM
antifreeze leak on back corner of engine
by ram_man
07/28/14 12:03 AM
Man killed, daughter injured in plane crash...
by hatt
07/27/14 11:25 PM
Hyundai Elantra manual trans fluid change help
by dja4260
07/27/14 10:51 PM
My Review of the 1997 Camry
by Nick1994
07/27/14 10:50 PM
M1 ESP 5W30
by e55amgbenz007
07/27/14 10:50 PM
"2013" 5.0 Stang oil?
by Camprunner
07/27/14 10:31 PM
7,000 miles on oil... change before trip?
by Klutch9
07/27/14 09:50 PM
Wiggling brake shim
by Klutch9
07/27/14 09:45 PM
Newest Members
Samial, TomHh, JPowell490, LubeMan52, Powermax
50782 Registered Users
Who's Online
34 registered (Charlie1935, Alltherage, bmod305, asiancivicmaniac, c502cid, Clubber_Lang, 6 invisible), 754 Guests and 217 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
50782 Members
64 Forums
216933 Topics
3414812 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG

Topic Options
#2417308 - 10/26/11 07:50 PM 1998 z71 front &rear diff's
Jaybird79 Offline


Registered: 11/01/10
Posts: 7
Loc: Illinois
Hi does anybody know if i can run Mobil 1 75w90 in both the front and rear differentials in this truck? Also do i need to put any LS additive in either one,it does have the Eaton G80 in the rear.

Top
#2418125 - 10/27/11 05:45 PM Re: 1998 z71 front &rear diff's [Re: Jaybird79]
artificialist Offline


Registered: 09/23/07
Posts: 6567
Loc: Florida
What does your owner's manual say your truck needs?
_________________________
2010 Lancer Ralliart Sportback

Top
#2418283 - 10/27/11 08:40 PM Re: 1998 z71 front &rear diff's [Re: Jaybird79]
Fazzone Offline


Registered: 08/17/09
Posts: 104
Loc: Mondovi Wisconsin
Yes, you should be fine. I had no issues in my last truck('98 GMC 1500 Z71) running it. As far as the LS additive, mine didn't need it, but I don't recall specifically which rear end was in it. The manual specs call for conventional in the front, but if you want to spend the extra $ go for it.
_________________________
2012 GMC 2500 HD

Top
#2418285 - 10/27/11 08:40 PM Re: 1998 z71 front &rear diff's [Re: Jaybird79]
Jaybird79 Offline


Registered: 11/01/10
Posts: 7
Loc: Illinois
SAE 80w90 GL-5 gear oil front and rear.

Top
#2418463 - 10/28/11 05:55 AM Re: 1998 z71 front &rear diff's [Re: Jaybird79]
NHHEMI Offline


Registered: 07/06/07
Posts: 5112
Loc: NH
Originally Posted By: Jaybird79
Hi does anybody know if i can run Mobil 1 75w90 in both the front and rear differentials in this truck? Also do i need to put any LS additive in either one,it does have the Eaton G80 in the rear.


You can run 75W90 synthetic in both and it would be an upgrade. No LS additive required with the G80 but if the fluid you select has it don't worry. It will still work fine.
_________________________
Royal Purple User Since 1990 thumbsup

2014 Jeep Cherokee
"Latitude"
3.2L V6 4WD( ADI )


Top
#2418503 - 10/28/11 07:49 AM Re: 1998 z71 front &rear diff's [Re: Jaybird79]
Jaybird79 Offline


Registered: 11/01/10
Posts: 7
Loc: Illinois
Thanks NHHEMI, just wanted make sure it would be okay. I can get the mobil 1 for about $4.00 a qt at AAP so I thought why not upgrade.

Top
#2419234 - 10/28/11 09:25 PM Re: 1998 z71 front &rear diff's [Re: Jaybird79]
wtd Offline


Registered: 06/25/02
Posts: 1152
Loc: southwest Mo.
I run shell coventional 80W-90 gear oil in my 98 Z71 but used to run Mobil 1 in both diffs. It might just be a coincidence but I had to have my rear end rebuilt at 75,000 miles with hardly any towing or hauling. After that I went back to conventional and now at 120,000 miles, no problems. I first started hearing noises at about 55,000 miles but could not figure out what it was and finally had it looked at professionally which ended up with the repair. Others have had good luck with it so for that price you might as well try it.

Wayne
_________________________
2014 Mustang GT
1998 Chevy K3500
1998 Chevy K1500
(2) 1992 Cavaliers
1970 Monte Carlo

Top